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Mad Men is returning after a long hiatus this Sunday. NPR's Elizabeth Blair looks at the reasons for the delay and what it might mean to fans.

Benedict XVI will be greeted by one of the world's largest Catholic populations when he visits Mexico on Friday. He is also traveling to Cuba, where the church has played an active role in seeking change.

Thousands of people are expected to descend on the Mall in Washington, D.C., on Saturday to celebrate not believing in God. Organizers say it is a chance for atheists to show their power in numbers and change their image.

Thousands of people gathered Thursday in Sanford, Fla., to rally for justice in the shooting death of an unarmed black teenager, Trayvon Martin.

North Korea's nuclear weapons program is threatening to overshadow the global Nuclear Security Summit in Seoul next week. Last month, North Korea said it would freeze its enriched uranium weapons program and its long-range missile activities in exchange for U.S. food aid. But a few days ago, North Korea announced plans to launch a satellite in April, which the U.S. says is counter to the agreement made last month. Now prospects for the deal are uncertain.

Louisiana holds its Republican primary Saturday. All four of the remaining candidates are campaigning in the state.

Profiles of the teenager killed in a case that has reignited a national debate about race and the man who pulled the trigger reveal a great deal about them both.

Jim Yong Kim is a physician by training and has been a prominent figure on global health issues. He is a former director of the World Health Organization's Department of HIV/AIDS.

Obama will nominate Dartmouth's president to head the World Bank... Friday is the second anniversary of Obama's signing the Affordable Care Act into law... Mitt Romney met Thursday with congressional Republicans to vow he would repeal the health law and say he was running to save the nation.

As part of an NIH-funded project, Bradley Smith, associate dean for creative work, research and graduate education at the University of Michigan, posted a collection of optical images and MRI scans of human embryos to the web. Intended for a clinical audience, Smith talks about the unexpected response he got from the public.